Safety-guard for power-presses.



J. WRIGHT. V SAFETY GUARD FOR POWER PRBSSES.

APPLICATION FILED JULY 20, 1912.

1,067,632. 1 Patented July 15, 1913.

5 SHEETS-SHEET 1.

\A/itnesses. Inventor:

J. WRIGHT.

SAFETY GUARD FOR POWER PRESSES.

APPLICATION FILED JULY 20, 1912 1,067,632. Patented July 15, 1913.

5 SHEBTSSHEET 2.

Mtnesses. Inventor.

J. WRIGHT.

SAFETY GUARD FOR POW BR PRESSES. APPLIUATION FILEI Y JULY 20, 1912.

1,067,632, Patented July 15, 1913.

6 fiHBETS-SHEET 3.

' J. WRIGHT.

SAFETY GUARD FOR POWER PRESSES. APPLIGATIOH FILED JULY 20, 1912.

1,067,632, Patented July 15, 1.913

5 SHEETS-SHEET 4.

m: as L 22 18 g I I Inventor Wxtnesses.

' 4 J. WRIGHT.

Patented July 15, 1913' 5 SHEETS-SHEBT 5.

136 15$ 73% m 136 W; I v 751 137 i nesses: m V Inventor 0- W 1w %)M r W i man srarus PATENT orries.

JAMES WRIGHT, ornn iitrou, oNTAnIb, cameags sieaoap ream-mares do wrmirnm szmrsolv STACEY, or Hnfirrn'ron, GANADh...

SAFETY-GUARD For: 'mwaaeaessns.

Loeaesa.

reference to stamping press guards which are adapted to prevent injury to the fingers or hands of the operator.

It is well known that presses of the types referred to are usually fitted with a clutchof any appropriate typ'einterposed be tween the source of power and the crank or eccentric or other mechanism actuating the reciprocating tool, and means such as a treadle or foot lever are provided for operating said clutch so as to cause the reciprocatory tool to perform its effective stroke, and vice versa to throw said tool out of action when desired. Varioussafety guards have been heretofore suggested for use in connect-ion, or in conjunction with the .inechanism for throwing the reciprocatory tool into operation to effectually prevent the said'tool being connected to the source of ower-@011 the. operation of the clutch treadle for throwing said tool into action-e should the fingers or hands or any part' thereof be in position to be crushed or injured by said tool, or in the event of any hand tool or other foreign body being accidentally placed or left in position to be crushed or touched by sa'idsafe'ty guard or tool.

The main object of my invention is to,-

provide a safety guard, which moves or always travels slightly in adyanoe of, and with, the reciprocating tool, and thereby positively the operator being warned of approaching danger A further feature of toy invention consists i'n arran ing the movement of the ro: tective element proper to synchronize with the operation of the press, in contradistinctio'n to devices heretofore constructed which are alrbre ght intothe' protective position by the movement or the foot lever or needle rior'tethe r'elease ofthe clutch. p

east-her very important feature of my in:

- ings.

speoificatidn of Lettersrathit. Patented J i11 41 Application filed July 1912. Serial 166; 710,644.

vention consists in providing a safety guard for power presses which acts as a brake on the clutch and automatically and instantly stops the further movement of the recipr0 oatory tool'in the event of any obstruction lyingin the path of the protective element during its descent.

Another object of my invention is to provide a simple and effective means whereby for certain classes of work't-he operator is compelled to manipulate the stock in a plane below the upper face of the lower die.

With these and other objects in View, as will more fully construction, combinations and arrangehereinafter appear, my invent on consist-s 1'11 certain novel features. of

ments of parts hereinafter fully described;

illustrated the accompanying drawings forming a part of this specification, and more particularly pointed out in the appended claims. Y i

In the accompanying-drawings, Figure 1, is a front perspective view of a stampin press fitted with one form of my improved safety guard. Fig. 2, is asimilar view of thereof. Fig; 3, is an enlarged side elevation' of the safety guard shown in connec tion with the press illustrated by Figs. 1, and 2, -but with parts broken away or in section for the sake of clearness'. Fig. 4, is a rear elevation of Fig. 3. Figs. 5, and 6, are respectively an elevation and underside plan of one of the spring controlledplungers or gripping teeth hereinafter more specifically referred tb. Fig. 7 is a detail side elevation of .a stationary and adjustable guide bar or frame which may be used in conjunction with my invention where the stock has to be held or handled by the operator, during the process of stamping or cutting. Fig. 8, is a top plan of the same.

Fig. 9 is a side elevation of a guide bar used where the. stock is held by the operator during the stamping process, and Fig. 10 is a plan view thereof. v

' Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the draw- According to the form of my invention illustrated more particularly in Figs. 1, to 6, and which represent one fo'rmof stamping press having my invention applied thereto, and of which presses there are several kinds,

so the same machine but taken from the rear l 1 tached thereto, small modifications onlybe- 6. 6. on the aforesaid standards 1. 1..

all of which can have device readily at,-

at the upper ends of the standards 1,1, and.

it is provided with an eccentric or crank 9, c nnected with thecrosshead, and a continuouslprotatmg driving wheel or pulley 10,

.which is mounted on one end of the shaft 7,

and is coupled therewith or uncoupled there from by a clutch 11, allof which parts may be of any usual or suitable construction. The clutch 11, is ofwell-known, form and is fitted with the usual tripping device or dog, by means of which the plunger or crosshead 5, is coupled thereto and caused to descend and ascend, and said dog is controlled by means of a connecting rod 12, coupled to the foot lever ortreadle 13, which is under the action of a spiral or other su table spring 14, 1n-- the known way. 15, is the protective ele ment or guard proper arranged, mounted and operated according to my invention, as follows: This guard proper 15, may be of any suitable pattern or contour in plan to suit the male die of the press to which the device is to be attached, and, it is preferably fashioned with a laterally and rearwardly projecting lug 16, to permit of its lateral adjustment on a rod 17, furnished withan eye-piece 18, for adjustable connection to the lower end of an oscillatory rod 19. This oscillatory rod 19, is carried. by a. block or pivotally mounted piece 20, audit is furnislied at its upper part with a laterally or rearwardly projecting tooth 21, for the purpose hereafter to be explained. The pivotally mounted piece 20, isas shown-preferably pivotally connected by a pin 22', to a bracket or hearing 23, conveniently secured on the press plunger. 24, is one of the cross i ties connecting thestandards 1, 1, together.

Parallel with and rearward ofthe aforesaid rod 19, I arrange a depending and rigidly secured rod 25', which is adapted to serve as a guide or support for adjustable blocks rod 19. 32, is a link or bar. adjustably connected at 33, to the depending rod 25, and it is fitted at its forwardend with a bent back portion 34, in which is 're-volubly mounted an anti-friction roller 35, which normally serves as a guide for the aforesaid oscillatory rod 19, but at the same time it is so positioned as to cooperate with the stop 31. for the purpose hereafter explained. The rigid rod 25, is carried by a laterally and rearwardly projecting bracket 36, to which it is,adjustably connected by lock-nuts 37, 37. at its upper end. and said bracket 36, is con veuiently secured to or carried bytlie upper I part ofthe afor esaid framework 1, 1. Trans versely of the upper part of the framework 1, 1, I mount in brackets 38, 38, a shaft or spindle 39, which serves, when the aforesaid oscillatory rod 19, is moved rearwardly on its supporting center 22, to release the clutch locking mechanism now' to be described. This comprises a brake strap 40, in which are radially located a series of spring-controlled plungers or movable gripping devices 41, 41. Each of said gripping devices 41, 41, comprises a' shank portion 42, (Figs. 5 andG) of the cross-section shown by the underside plan in Fig. 6, and an extension 43, which is surrounded by a spiral spring 44, and'said gripping devices are longitudinally adjustable by a locknut ornuts 4."). In the form of my invention shown these gripping devices are formed with butt ends,

but in order to etfectivel insure more mstantaneous and effective action their inner ends may be toothed as shown at 46, in Figs. 5, and 6, whereby-when released-they are rendered doubly effective to arrest a further movement of the dog controlling the operation of the clutch 11, above referred to. The gripping or arresting devices 41, 41, are arranged for. radial movement outward by means of a strap 47, which is adapted to be concentrically and radially moved by wiper arms 48, 48, furnished with anti-friction rollers 49, 49, conveniently housed in cor're-- spondingly shaped recesses in the aforesaid brake strap 40. These wiper arms 48, 48, are connected together by a cranked arm 50, so that when moved about their axes as hereafter explained, the entire series'of radially I disposed'grippingdevices 41, 41, are simultaneously raised or lowered into operative engagement with the clutch release. In order to attain this end the gripping devices are arranged to all contact with the strap or concentric piece 47 in' such manner that when the wiper arms 48, 48", are raised or lowered the members 41, are simultaneously and synchronously raised or lowered.

51, Figs. 3, an 4, is a detent 0r pawl for preventing back motion of the spindle 39, and medially of said spindle 39, I fix an arm or lever 52, which in turn is hingedly con nected at 53, to a rocking bar 54, provided esa-sea with a depending portion 55, in which is' revolubly mounted an anti-friction roller 56, arranged to normally contact with the front side of the oscillatory rod 19. This rocking bar 54, is slotted at its rear part 57, to provide a clearance for the tooth 21, aforesaid and for the purpose hereafter explained.

58, is a stop or pin on the underside of the depending portion 55, which rests normally on the laterally andrearwardly extending racket 36, that supports the rigid rod 25, above described. w

60. is a lever adjustably connected at 61, to a link 62, united hingedly at its lower end 59, to a lever 63, rigidly secured to the shaft or spindle of the lower wiper 48. Thus it will be readily seen that when the levers 60, and 63, are raised or lowered the strap 47, will he moved radially outward or inward and thereby. efi'ect the operation of the memhers 4:1, as above stated. Obviously the lever and links 60, 62, respectively may be otherwise connected so as to insure uniformity of action, and I wish it understood that I may fit one or both of said levers or link with hand grips-in order to facilitate the returning of the several parts to their normal position. In order to make ready provision for accurately adjusting the brake to diiferent sizes of presses I provide both the lever and link 60, 62, respectively with a series of holes 64, 64, through which the connecting pivotal pin 61, is passed as desired.

65, 65, are clamping studs or bolts by, means of which the entire device is rigidly secured to the side of the press adjacent the clutch, audit is evident the holes through which the shanks 42, of the plungers 41, pass the strap d7, are elongated to give the requisite clearance.

Obviously the pivotally mounted block or piece 20, may be reversely located to the position shown and thereby render the device more sensitive; for example the parts may be so arranged that a thickness of stout paper interposed between the underface of the protective element 15, at the point/66, Fig. 3, and the upper face of the female die will be quite sufiicient to cause the oscillatory rod 19, to be thrown sufficiently rearward for the projecting tooth 21, to contact either with the upper or lower rear end of the rock bar Instantly such contact takes place the transverse spindle 39, is turned about its axis and the lever and link 60, 62, respectively, are tripped, which throws the wipers 48, 48, past their supporting centers for the strap 47, whereupon the full force of the springs 1d, 44, is brought into play and the entire set of plungers 42, are radially projected inward and jammed in the path of the clutch dog thus instantly arresting its further driving effect or force. The action of these plungers is more than a mere clutch releasing actiomfor it is to-be understood that the plungers exert a and retarding edeot upon tne 'rotative ele ment by which said do fds carried and'by which motion is imparted to shaft 8 in a -mannerwell kngwn. This part of my in vention Will be clear to and fully understood distinct braking by all those skilled in the art to which it ap v pertains and it will he further seen that by staggering the plungers 42, as shown in Figs. 3, and d, the device is rendered doubly sensitive. Furthermore I may crosscut or notch the nose of the clutch dog itself to render itmore efiicient and easier engaged by one or more of the plungers 42. Prz'ma facie, in very large presses the rows of plungers 12, may be multiplied in staggered relation and I wish to here point out that by actual experiments I find that no matter what the size or weight of the press plunger or reciprocating part may be the device is instantly efi'ective when'the slightest obstruction lies in the downward path of the protective element or guard 15. A further important point to be particularlynoted in connection with my invention is the fact that the oscillatory rod 19, and

- guard 15, lie in planes atsubstantially right angles one to the other, and that the distance from the point of suspension 22, of the protective portion of said guard 15, is many times less than that of the tooth. 21, to said point of suspension. Or, in other words, a

very slight movement or tilting of the guard 15, is considerably mu tiplied as regards the movement of the toot \21. tion lies in the path of the guard 15, the oscillatory rod 19, is moved aertically up and down with the press plunger to the rear of which it is connected by the bracket 23, above referred to. Qnce the brake device is thrown into action the pressplunger iseffectively stopped and cannot be moved in either direction until the operator goes behind t-he press and raises the strap 47, by forcing up the lever 63, and its connected parts to the position shown mostclearly in Fig. ,3. Thus it will be clearlyseen that no matter what the obstruction isin the path of the protective element 15,,ittmust be re:

moved before further work can leeopen ated on. p,

106, Fig. 1, is a stripper of appropriate pattern under the influence of springs 109, carried by the press plunger or oross-head 5.

For certain classes of work it is essential that the operator handle the stock while being operated on, and in such cases-I employ the device shown by Figs. 7 and8, in combination with the guard above described. This device consists of angle pieces the vertical links 131, whereof are slotted at 13 2,

If no obstrucand they are conveniently clamped. to the sides of the press frame or the -.guides 6, 6, by set screws 133, 133, which permit-cf the device 1 being vertically adjusted. ."lhenletq era-l links 134,, 134,0f the angle pieces are turned into a horizontal plane and slotted at 135,. 135, to receive clamping, bolts 136,-

136, which hold in place a strip 137. This device is adjusted so that the horizontal limbs 1,34, 134, are on a plane with the top,

' Obviously the angle pieces may be inverted and clamped to the table'Q, of the press, without dep irting from the spirit and scope of my infve ion. This rigid attachment .is particularly use ful for cases where the operator is working on cup-shapes having holes punched in their s1des when t is necessary for said operator to hold the cup shape in place. In such cases the strip 137, will beset so as to com. pel the operator tohandle his work from under said strip 137, where his hands will besafe and free from any chance of injury.

If he should forget and put his hand or fingers over the strip 137, he will be struck by the descending stripper 106, or guard 14,

when the press will'be instantly stopped as above set forth. The top edge of the strip 137, will never be arrangedor adjusted below the face of the lower die thereby rendering it impossible to get the fingers over the guard and under the punch proper.

The operation of' my improved safety guard is briefly as follows :.As the punch 4,

descends, the guard 15, and, or stripper 106, will travel slightly in advance thereof. If.

there be no obstruction encountered said guard 15, and, or stripper 106, will be lifted when it contacts with the lower die 3. 'This movement will synchronize with the stop 31,

contacting with the arm 32, whereupon the rod 19, will beallowed to tilt rearwardly in the slot 57, without engaging the rock bar 54, that releases the clutch' brake 40.

From the foregoing description and accompanying drawings it will be readilyseen that by my lnvention I provide an extremely effective and reliable devicefor the purposes set forth, while at the same time in no way interfering with the utility or efficiency of the press, all that is necessary being the tap ping ofthree or four holes and insertion of set screws to attach the entire device in position.

Obviously my invention may be readily k adapted to. any type of. stamping press or machine having a reciprocatory tool worked or operated bya'clutch relea 3e mechanism, as all parts are made relatively adjustable, and I wish it clearly understoodthat I do not confine myself to the specific arran' ements and combinations of parts illustra ed and described, various alterations in their form and the arrangement thereof being possible without in any way departing from the spirit and scope of the invention, and it is intended fully to include all such within. the present application, and as limited by the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

-1.' In a safety guard for stamping presses, the combination with a driving-member of the press,'of a brake element, a guard ele- .ment, and means for causing said brake ele ment to engage saiddriving member of the press when said 2. In a safety guard for stamping presses, the combination with a driving member of the press, of a toothed brake member, a guard element, and means for causing said *toothed brake'member toengage said driving member of the press when said guard element encounters an obstruction.

'3. In a safety guard for stamping presses,

guard element encounters an obstructlon.

the combination with a driving member of the press, of a brake element, a guard element, means for causing said brake element tpengage said driving member of the press when said guard elementencounters an ob struction, said brake member comprising a plurality of radially disposed members, and

a connecting strap for all of said radially disposed members, whereby all of said radially disposed members are moved simultaneously to and from operative position.

4. In a safety guard for stamping presses, the combination with a driving member of the press, of a brake element, a guard ele ment, means for causing said brake element, to engage said driving member of the press when said guard element encounters an ob struction, said brake element comprising a plurality of radially disposedspring actuated plungers, and a strap through which all of said pluhgers pass.

5. In a safety guard for stamping presses, i

the combination with a drivingimember of the press, of-a brake element, a guard ale-- ment, means for causingv said brake element to engage said driving member of the press when said guard element encounters an obstruction, said brake element comprising a plurality of radially disposed spring actuated, plungers; and a strap through which all of said plungers loosely pass.

6: In a safety guard for stamping presses,

thecombination with a driving member of the press, of a brake element, a guard element, means for causing said brake element to engage said driving member of the press when saidguard element encounters an obstruction, said brake element comprising an menace ating said con-trolling member when tilted out of normal alinement.

8. In a safety guard for stamping presses, the combination with a movable press member, of a restraining mechanism, a press driving element upon which said restraining mechanism acts, a controlling member for said restraining mechanism, and a guard carrying element movable bodily with the' movable press member and pivotally mounted upon said press member and engaging and actuating said controlling member when tilted out of normal alinement by the'contact of the guard with an obstruction.

a 9. In a safety guard for stamping. presses, the combination with a movable press mem-.

ber, of a braking mechanism, a press driving element upon whichsaid bra g mechanism acts, a controlling member for said braking mechanism, and a guard carrying element movable bodily with the movable press member and pivotally mounted upon said press "member and engaging and actuating said' controlling member when tilted out of normal alinement by the contact of the guard with an obstruction, said braking mechanism comprising a plurality of radially disposed members. I

10. In a safety guard for stamping presses, the combination with a movablepress member, of a braking mechanism, a press driving element upon which said braking mechanism acts, a controlling member for-said braking mechanism, a guard carrying element movable bodily with the movable press member and pivotally mounted upon said press member-and engaging and actuating said controlling member when tilted out of normal alinement by the contact of the guard with an obstruction, said braking mechanism comprising a plurality of radially disposed spring pressed members.

11. In a safety guard for stamping presses, the combination with a movable press member, of a braking mechanism, a press driving element upon which said braking mechanism acts, a controlling member for said braking mechanism, and a guard carrying element movable bodily with the movable press member and pivotally mounted upon. said press member and engaging and actuating said controlling member when tilted out of normal alinement by the contactof the guard with an obstruction, said braking mechanism comprisin a plurality of radially'disposed toothed plungers.

12. In a safety guard for stamping presses, the combination with a movable press member, of a braking mechanism, a pressdriving element upon which said braking mechanism 1 acts, a controlling member for said braking mechanism, a guard carrying element movable bodily with the movable press member and pivotally mounted upon said press member and engaging and actuating saidv controlling member when tilted out of normal-alinement by the contactof the guard with an obstruction, said brakingmechanism comprising a plurality of radially disposed spring pressed members, an acommonactuating member for all of said plungers.

13. In a safety guard for stamping presses, the combination with a movable press member, of a braking mechanism, a controlling member for said braking mechanism, a press driving element upon which said braking-mechanism acts, a guard'carrying element movable bodily with the movable press member and pivotally mounted upon, said press member and engaging and actuating said controlling member when tilted out-of normal alinement by the contact of the guard with an obstruction, said braking mechanism comprising a plurality of radially disposed toothed'plun ers, and

a common actuating member for al \of said 'plungers.

14. In a safety, guard for stamping presses, a restraining brake comprisingan arcuate member, a plurality of radially disposed brake elements, means for actuating said elements in one direction, a pressactuated member for actuating said elements in the opposite direction and against thetension of said means.

1.5. In a safety guard for stamping presses, a restraining brake mechanism comprising an arcuate member, a'--plurality of radially disposed spring pressed plungers mounted therein, a common actuating strap for all of saidplungers, cranks arranged adjacent each end of said strap and arranged when actuated to move said strap against the tension of said springs, and a member for actuatingsaid cranks simul taneously. v

16. In a safety guard for stamping presses, a restraining brake mechanism comprising an arcuate member, a plurality of radial y disposed spring pressed plungers mounted therein, a common actuating strap for all of said plun ers, cranks arranged adjacent each end 0 said strap and arranged when actuated to move said strap against'the tension of said springs, a memher for actuating said cranks simultaneously, a guard carrying element bodily movable with and pivoted upon the press plunger, and means for actuating said cranks when'said guard carrying element is swung out of normal alinement by contact with an obstruction; I v

17. In a device of the characterdescribedthe combination with a vertically movable press plunger, of a rod pivotally mounted thereon and bodily movable therewith, a-

guard element carried by said rod, a restraining brake, an actuating member for i said brake through which said rod travels, the tilting of. said rod'upon its pivotal point when the guard'strikes an obstruction serv-' ing to move said brake actuating member.

18. In-a device of thei -character described, the combination with a press and its vertically movable tool'carryingmembenof a guard carrying rod pivotally mounted upon said plunger and bodily movable therewith, a

guard carried by said guard carrying rod, a

restraining brake mechanism, an operating member for said brake mechanism, said guard carrying rodtraveling in a cut out portion of said operating member, and a projection carried by said rod and adapted to engage and actuate said brake controlling member when the guard carrying rod is I tilted upon its pivot.

19'. In a device of the character described, the combinationwith a restraining brake, of a controlling member therefor, a guard carrying rod passing through said controlling member and movable in a. cut out portion thereof, a block pivotally mounted upon the (press plunger and through which .sald guar carrying member passes, and a guard carried by said guard carrying member.

- 20. In a device of the character described,

the combination with a restraining brake,

therewith, a guard carried by said guard carrying rod, a controllin member for the brake mechanism, an anti riction roller car ried by said controlling member and-bearing against the guard carrying rod, a fixed member, a lever pivotally mouned thereon, an anti-friction roller carried by said j lever bearing upon the guard carrying rod,

and a spring connection between said leyer and said guard carrying rod.

22. In a device of the character described, the combination with a restraining brake mechanism, of a shaft mounted upon a fixed portion of the press frame, a horizontally disposed controlling member, an ar1ncarried by said shaft to which one end of said controlling member is pivoted, and means ried by said shaft to which one end of said controlling member is pivoted, means actuated by said shaft for controlling the brake mechanism, a guard carrying rod,'a guard carried by said rod, and means carried by said rod for actuating said controlling member when said rod is tilted out of vertical alinement.

24. In a device of the character described, the combi'nationwith a restraining mecha nism, of a shaft mounted upon a fixed portion of the press frame, a horizontally dis-,

posed controlling member, an arm carried by said-shaftto which one end of said controlling member is pivoted, means actuated by said shaft for controlling the brake mechanism, a guardcarrying rod, a guard carried by said rod, and means carried by said rod for actuating said controlling member when said rod is tilted out of vertical alinement, said rod being pivotally mounted upon and traveling with the press plunger. 25. In a device of the character described, the-combination with a stamping press, '01

,a vertically movable guard," and a fixed member arranged in such position that the stock must be handled therebeneath and so keep the fingers of the operator out of the path of said guard.

, Signed 'at Hamilton, Ontario, this 18th day of July, 1912.

' JAMES l/VRIGHT.

In the presence of GERTIE NICHOLSON,

ALFRED T. BRATTON.

Canada,

" Gopfoa of this patent may be obtained for five cents each, by addressingfhe Commissioner of Patents,

' Washington, D. G. v 

